A reasonable estimate for the height of the walls in an ordinary American home is 2.5m. But luxury houses are of 3m.
The house patterns depend on residents preference of pattern and some of the patterns of American houses are Colonial houses, Ranch houses etc.
And the pattern which is often seen is America as the classic family style is Cape Cod style. And these houses are identified by their shingle exteriors.
American houses commonly have 2 entrance front door. Accordingly one for the day to day business and other entering into a formal place.
To know about commonly here
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probably by the government
